<template>
      <div class="todo-header">
        <input 
        type="text" 
        placeholder="请输入你的任务名称，按回车键确认" 
        v-model="title"
        @keyup.enter="add"/>
      </div>
</template>
<script>
import {nanoid} from 'nanoid'
export default {
  name:'MyHeader',
  // props:["addTodo"],
  data(){
    return{
      title:'',
    }
  },
  methods:{
    add(){
      // 校验数据
      if(!this.title.trim()) return alert('输入不能为空')
      const todoObj = {id:nanoid(),title:this.title,isDone:false}
      // 传递给App组件的值
      // this.addTodo(todoObj)
      this.$emit('addTodo',todoObj)
      // 清空输入
      this.title = ''
    }
  }
}
</script>

<style scoped>
/*header*/
.todo-header input {
  width: 560px;
  height: 28px;
  font-size: 14px;
  border: 1px solid #ccc;
  border-radius: 4px;
  padding: 4px 7px;
}

.todo-header input:focus {
  outline: none;
  border-color: rgba(82, 168, 236, 0.8);
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
}
</style>

